Signal device



Malh 19, 1935- R.. M. cRlTHFn-:LD 1,994,575

S XGNAL DEVICE Filed May 31, 1930 Q ln/vento@ Q v ROBERT W. CRITCHFIELD C r MM- l, 'H1/Lm ML 9W um M114 Patented Mar. 19, 1935 1 SIGNAL nevica I Robert M. Critchfield, Anderson, Ind., .assignon by mesne assignments, toGeneral Motors Cor'- poration, Detroit, Mich.,

f warek a corporation of Dela- Appiicanonmay 31, 1930, serial No. 458,609 7 aciaims. (cig 177%);7"

This invention relates to improvements in signal devices and particularly to mounting means Y for such devices.

Itis among the objects of the present invention to provide a signal device with a mounting means which substantially prevents vibrations of the signal device from being transmitted to the member supporting it, or vibrations of said supporting member from being transmitted to the signal device.

Another object is to provide a mounting member integral with the signal device.

Further objects and advantages of the present invention will be apparent from the Afollowing description, reference being had to the accompanying drawing wherein a preferred embodiment of one form of the present invention is clearly shown.

In the drawing:

Fig. 1 is a section taken along the line 1 1 of Fig. 2.

Fig. 2 is a rear View of the signal device. g

Referring to the drawing, the signal device comprises a casing 20, cup-shaped and having an annular flange 21. A perforated cover 22, dishshaped, is provided for the casing and is secured thereto by bolts 23 which extend through openings in the annular flange 21 of the casing. A sound-producing diaphragm 24 has its peripheral edge clamped between the casing 20 and its cover 22. At the central portion ofthis diaphragm 24 are provided magnetic plates 25 which support a stud 26 coaxially of the casing. Upon this stud, resonator disc 27 is mounted.

The diaphragm 24 is set into motion by an electro-magnet which comprises a field frame 30, a core 3l and a winding 32, mounted upon said core. The core has an enlarged head 33 which normally lies in juxtaposition to and parallel 40 with one of the magnetic plates 25 carried by the diaphragm 24. Core 31 has a reduced `portion 35 which extends through an opening in the field frame 30 and an opening in the casing 20. A suitable interrupter including the movable contact 36 and the stationary contact 37 is provided within the casing 20, the movable contact being engageable by a plunger 38 carried by the diaphragm block 25 so that asgthe diaphragm vibrates, contact 36 is moved into and out of engagement with its stationary contact 37 to control the circuit through the winding 32 of the electromagnet.

The mounting of the device comprises two spring blades 40, held inspaced relation by members 41 and 42, placed between said spring blades at opposite ends. A metal washer 43 is placed upon the outer surface of the outer spring blade 40. The spring blades and the block 42 and washer 43 have aligned openings through which the reduced portion 35 of the core extends, the end of the core being spun over the Washer 43 as at 44 whereby the spring blades and member 42 and washer 43 are rigidly clamped to the housing 20, and likewise the magnetic field 30 of the electromagnet is rigidly clamped to the inside of the casing.

The member 41 forms the intermediate cross arm of a U-shaped supporting bracket which alsohas substantially parallel side arms 45 and 46.' The spring blades 40 are secured to the cross arm 41 by rivets 47. The endsof the side arms 45 and 46 of the supporting bracket have feet portions 49, shaped to conform with the contour of the supporting member 50, which may be any suitable part to which the sound signal device is to be secured. This supporting member may be the 4cross rod acting as a brace between the headlights of the vehicle. Each foot 49 of the mounting bracket is attached to the supporting member 50 by a screw 51.

It will be noted that the spring'blades 40 are substantially parallel with the diaphragm 24 so that said spring blades, if vibrating at all, will tend to vibrate coincidentally with the diaphragm 24, and not in a counter direction.

In the present invention applicant has provided a resilient mounting for a sound signal,

vforming an integral part of said sound signal and being adapted to permit full sound producing vibrations of the sound signal, yet substantially preventing such vibrations from being transmitted from the sound signal to its supporting device, or any vibrations of the supporting device from being transmitted to the sound signal, materially to ailect the eiicient 'operation of said sound signal.

The device is of simple structure and design. A portion of the electromagnet serves also to attach the resilient mounting member to the sound signal, thereby eliminating separate attaching means.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, 'all coming within the scope of the claims which follow.

What is claimed is as follows:

1. An electromagnetic sound signal having a casing, a core, and a eld frame, in combination with, a plurality of resilient members secured to 20 on each side of the resilient members; and means 1 the housing by a portion of the core, a U-Shaped bracket having the arms thereof bent away from the plane of the cross-member, said arms having the free ends thereof apertured and deformed to embrace a support, means for attaching the resilient members to the cross member, and means lfor securing the arms to the support so that the axes of therapertures in the arms are substantially in the same plane with the axis of the core.

2. A support for a sound signal having alcore,V

a field frame, and a plurality of spaced flat springs secured to the housing of the sound signal by a portion of the core, comprising'in combination' a U-shaped bracket having across member interposed between the at springs, means for securing the at springs to the cross-member, said bracket having the arms thereof bent away from the normal plane of the cross member and located for securing the arms to a support to permit the springs to vibrate free of the support when the sound signal is actuated. f

3. In a sounding signal in which va magnet lmotor including a magnet cup and a' core is supported coaxial with the housing by the core mem'- Y ber, the combination oigaplurality of parallelY spring plates secured at one `end tothe housing by the vcore member, said 'plates supporting a bracket at theirbther end, said bracket comprising, a cross member and apair of arms bent away 'from the normal plane of the cross-member and having the ends thereof deformed to embrace a support, means passing through the .A

support and screw threaded to the arms .taper--VV mit the springplates to vibrate intermediate the arms and free of the support when said signal f isv actuated.

ROBERT ML CRITCHFIELD. 20 

